The gaskets between the manifold and head and between the manifold and front exhaust pipe are not reusable. Toyota also specifies that the mounting nuts be replaced.

Disconnect the negative battery cable.

Apply penetrating oil to the nuts and bolts, as required.

Remove the nuts from the front pipe that connects the manifold to the three-way catalytic converter

Detach the oxygen sensor electrical connector.

Remove the small bolts that hold the heat insulator to the manifold.

Remove the eight nuts and separate the manifold from the cylinder head. Discard the gasket.

To install:

Installation is the reverse of the removal process. Examine the replacement exhaust manifold-to-head gasket. Original equipment Toyota gaskets should have white paint marks on them. The white painted marks should face the manifold side. Use care to install the gasket in the correct direction.

Using a new gasket, install the manifold using care to align the studs with the front pipe. A new gasket between the manifold outlet and the front pipe is also required. Use new service replacement nuts. Uniformly tighten the nuts to 33 ft. lbs. (44 Nm).

Install the heat insulator and tighten the four bolts to 66 inch lbs. (7.5 Nm).

Tighten the manifold-to-front pipe nuts to 46 ft. lbs. (62 Nm).

Connect the negative battery cable, start the engine and verify no exhaust leaks.

5VZ-FE Engine

Fig. Exhaust manifolds and related parts-3.4L engine

Before servicing the vehicle, refer to the Precautions section.

Remove or disconnect the following:

Exhaust crossover pipe, from the exhaust manifold by removing the 3 nuts

Exhaust Gas Recirculation (EGR) pipe, from the exhaust manifold, on the left manifold equipped with an EGR valve

Exhaust manifold heat insulator, by removing the 3 nuts

Exhaust manifold

Fig. Exhaust crossover pipe mounting nut locations-3.4L engine

Fig. Exhaust manifold nuts-3.4L engine

To install:

Install or connect the following:

Exhaust manifold, using a new gasket. Tighten the nuts to 30 ft. lbs. (40 Nm).

Exhaust heat insulator. Tighten the nuts to 71 inch lbs. (8 Nm).

EGR pipe to the exhaust manifold, if equipped with an EGR valve. Tighten the manifold nuts to 14 ft. lbs. (18 Nm) and the clamp nuts to 71 inch lbs. (8 Nm).

Crossover pipe to the exhaust manifold, using a new gasket. Tighten the nuts to 33 ft. lbs. (45 Nm).

Left Side

Fig. Exhaust manifold arrangement-3.4L (5VZ-FE) Engine

Fig. Removing the bolts securing the crossover pipe to the manifolds-3.4L (5VZ-FE) Engine

Fig. Exhaust manifold retaining nut locations-3.4L (5VZ-FE) Engine

Disconnect the exhaust crossover pipe and gaskets from the exhaust manifold.

Remove the heat insulator (shield) from the manifold.

Unfasten the retainers, then remove the manifold.

To install:

Install the exhaust manifold to the engine with a new gasket. Tighten the nuts to 30 ft. lbs. (40 Nm).